﻿/*
 Copyright (c) 2005 Poderosa Project, All Rights Reserved.
 This file is a part of the Granados SSH Client Library that is subject to
 the license included in the distributed package.
 You may not use this file except in compliance with the license.

  I implemented this algorithm with reference to following products though the algorithm is known publicly.
    * MindTerm ( AppGate Network Security )

 $Id: DES.cs,v 1.4 2011/10/27 23:21:56 kzmi Exp $
*/
using System;
using Granados.Crypto;

namespace Granados.Algorithms {
    /// <summary>
    /// 
    /// </summary>
    /// <exclude/>
    public class DES {
        private const int BLOCK_SIZE = 8; // bytes in a data-block

        uint[] _key;
        byte[] _iv;
        byte[] _temp;

        public DES() {
            _key = new uint[32];
            _iv = new byte[8];
            _temp = new byte[8];
        }
        public void SetIV(byte[] newiv) {
            Array.Copy(newiv, 0, _iv, 0, _iv.Length);
        }
        public void SetIV(byte[] newiv, int offset) {
            Array.Copy(newiv, offset, _iv, 0, _iv.Length);
        }

        public void InitializeKey(byte[] key, int offset) {
            uint i, c, d, t, s, shifts;

            c = CipherUtil.GetIntLE(key, offset + 0);
            d = CipherUtil.GetIntLE(key, offset + 4);

            t = ((d >> 4) ^ c) & 0x0f0f0f0f;
            c ^= t;
            d ^= t << 4;
            t = (((c << (16 - (-2))) ^ c) & 0xcccc0000);
            c = c ^ t ^ (t >> (16 - (-2)));
            t = (((d << (16 - (-2))) ^ d) & 0xcccc0000);
            d = d ^ t ^ (t >> (16 - (-2)));
            t = ((d >> 1) ^ c) & 0x55555555;
            c ^= t;
            d ^= t << 1;
            t = ((c >> 8) ^ d) & 0x00ff00ff;
            d ^= t;
            c ^= t << 8;
            t = ((d >> 1) ^ c) & 0x55555555;
            c ^= t;
            d ^= t << 1;

            d = ((d & 0xff) << 16) | (d & 0xff00) |
                ((d >> 16) & 0xff) | ((c >> 4) & 0xf000000);
            c &= 0x0fffffff;
            shifts = 0x7efc;

            for (i = 0; i < 16; i++) {
                if ((shifts & 1) != 0) {
                    c = ((c >> 2) | (c << 26));
                    d = ((d >> 2) | (d << 26));
                }
                else {
                    c = ((c >> 1) | (c << 27));
                    d = ((d >> 1) | (d << 27));
                }
                shifts >>= 1;
                c &= 0x0fffffff;
                d &= 0x0fffffff;

                s = SKB[0, (c) & 0x3f] |
                SKB[1, ((c >> 6) & 0x03) | ((c >> 7) & 0x3c)] |
                SKB[2, ((c >> 13) & 0x0f) | ((c >> 14) & 0x30)] |
                SKB[3, ((c >> 20) & 0x01) | ((c >> 21) & 0x06) | ((c >> 22) & 0x38)];

                t = SKB[4, (d) & 0x3f] |
                SKB[5, ((d >> 7) & 0x03) | ((d >> 8) & 0x3c)] |
                SKB[6, (d >> 15) & 0x3f] |
                SKB[7, ((d >> 21) & 0x0f) | ((d >> 22) & 0x30)];

                _key[i * 2] = ((t << 16) | (s & 0xffff));
                s = ((s >> 16) | (t & 0xffff0000));
                _key[(i * 2) + 1] = (s << 4) | (s >> 28);
            }
        }

        public void BlockEncrypt(byte[] input, int inOffset, byte[] output, int outOffset) {
            uint t;
            int i;
            uint[] lr = new uint[2];

            lr[0] = CipherUtil.GetIntLE(input, inOffset);
            lr[1] = CipherUtil.GetIntLE(input, inOffset + 4);

            initPerm(lr);

            t = (lr[1] << 1) | (lr[1] >> 31);
            lr[1] = (lr[0] << 1) | (lr[0] >> 31);
            lr[0] = t;

            for (i = 0; i < 32; i += 4) {
                desCipher1(lr, i);
                desCipher2(lr, i + 2);
            }

            lr[0] = (lr[0] >> 1) | (lr[0] << 31);
            lr[1] = (lr[1] >> 1) | (lr[1] << 31);

            finalPerm(lr);

            CipherUtil.PutIntLE(lr[0], output, outOffset);
            CipherUtil.PutIntLE(lr[1], output, outOffset + 4);
        }

        public void BlockDecrypt(byte[] input, int inOffset, byte[] output, int outOffset) {
            uint t;
            int i;
            uint[] lr = new uint[2];

            lr[0] = CipherUtil.GetIntLE(input, inOffset);
            lr[1] = CipherUtil.GetIntLE(input, inOffset + 4);

            initPerm(lr);

            t = (lr[1] << 1) | (lr[1] >> 31);
            lr[1] = (lr[0] << 1) | (lr[0] >> 31);
            lr[0] = t;

            for (i = 30; i > 0; i -= 4) {
                desCipher1(lr, i);
                desCipher2(lr, i - 2);
            }

            lr[0] = (lr[0] >> 1) | (lr[0] << 31);
            lr[1] = (lr[1] >> 1) | (lr[1] << 31);

            finalPerm(lr);

            CipherUtil.PutIntLE(lr[0], output, outOffset);
            CipherUtil.PutIntLE(lr[1], output, outOffset + 4);
        }

        private void desCipher1(uint[] lr, int i) {
            uint u = lr[1] ^ _key[i];
            uint t = lr[1] ^ _key[i + 1];
            t = ((t >> 4) + (t << 28));
            lr[0] ^= (SPTRANS[1, (t) & 0x3f] |
                SPTRANS[3, (t >> 8) & 0x3f] |
                SPTRANS[5, (t >> 16) & 0x3f] |
                SPTRANS[7, (t >> 24) & 0x3f] |
                SPTRANS[0, (u) & 0x3f] |
                SPTRANS[2, (u >> 8) & 0x3f] |
                SPTRANS[4, (u >> 16) & 0x3f] |
                SPTRANS[6, (u >> 24) & 0x3f]);
        }

        private void desCipher2(uint[] lr, int i) {
            uint u = lr[0] ^ _key[i];
            uint t = lr[0] ^ _key[i + 1];
            t = ((t >> 4) + (t << 28));
            lr[1] ^= (SPTRANS[1, (t) & 0x3f] |
                SPTRANS[3, (t >> 8) & 0x3f] |
                SPTRANS[5, (t >> 16) & 0x3f] |
                SPTRANS[7, (t >> 24) & 0x3f] |
                SPTRANS[0, (u) & 0x3f] |
                SPTRANS[2, (u >> 8) & 0x3f] |
                SPTRANS[4, (u >> 16) & 0x3f] |
                SPTRANS[6, (u >> 24) & 0x3f]);
        }

        private static void initPerm(uint[] lr) {
            uint t = ((lr[1] >> 4) ^ lr[0]) & 0x0f0f0f0f;
            lr[0] ^= t;
            lr[1] ^= t << 4;
            t = ((lr[0] >> 16) ^ lr[1]) & 0x0000ffff;
            lr[1] ^= t;
            lr[0] ^= t << 16;
            t = ((lr[1] >> 2) ^ lr[0]) & 0x33333333;
            lr[0] ^= t;
            lr[1] ^= t << 2;
            t = ((lr[0] >> 8) ^ lr[1]) & 0x00ff00ff;
            lr[1] ^= t;
            lr[0] ^= t << 8;
            t = ((lr[1] >> 1) ^ lr[0]) & 0x55555555;
            lr[0] ^= t;
            lr[1] ^= t << 1;
        }

        private static void finalPerm(uint[] lr) {
            uint t = ((lr[1] >> 1) ^ lr[0]) & 0x55555555;
            lr[0] ^= t;
            lr[1] ^= t << 1;
            t = ((lr[0] >> 8) ^ lr[1]) & 0x00ff00ff;
            lr[1] ^= t;
            lr[0] ^= t << 8;
            t = ((lr[1] >> 2) ^ lr[0]) & 0x33333333;
            lr[0] ^= t;
            lr[1] ^= t << 2;
            t = ((lr[0] >> 16) ^ lr[1]) & 0x0000ffff;
            lr[1] ^= t;
            lr[0] ^= t << 16;
            t = ((lr[1] >> 4) ^ lr[0]) & 0x0f0f0f0f;
            lr[0] ^= t;
            lr[1] ^= t << 4;
        }

        public void EncryptCBC(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) {
            int nBlocks = inputLen / 8;
            for (int bc = 0; bc < nBlocks; bc++) {
                CipherUtil.BlockXor(input, inputOffset, 8, _iv, 0);
                BlockEncrypt(_iv, 0, output, outputOffset);
                Array.Copy(output, outputOffset, _iv, 0, 8);
                inputOffset += 8;
                outputOffset += 8;
            }
        }

        public void DecryptCBC(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) {
            int nBlocks = inputLen / 8;
            for (int bc = 0; bc < nBlocks; bc++) {
                BlockDecrypt(input, inputOffset, _temp, 0);
                for (int i = 0; i < 8; i++) {
                    _temp[i] ^= _iv[i];
                    _iv[i] = input[inputOffset + i];
                    output[outputOffset + i] = _temp[i];
                }
                inputOffset += 8;
                outputOffset += 8;
            }
        }

        /* 
        * Copyright (C) 1993 Eric Young
        */
        private static readonly uint[,] SKB = new uint[,] {
            /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
            { 0x00000000,0x00000010,0x20000000,0x20000010,
            0x00010000,0x00010010,0x20010000,0x20010010,
            0x00000800,0x00000810,0x20000800,0x20000810,
            0x00010800,0x00010810,0x20010800,0x20010810,
            0x00000020,0x00000030,0x20000020,0x20000030,
            0x00010020,0x00010030,0x20010020,0x20010030,
            0x00000820,0x00000830,0x20000820,0x20000830,
            0x00010820,0x00010830,0x20010820,0x20010830,
            0x00080000,0x00080010,0x20080000,0x20080010,
            0x00090000,0x00090010,0x20090000,0x20090010,
            0x00080800,0x00080810,0x20080800,0x20080810,
            0x00090800,0x00090810,0x20090800,0x20090810,
            0x00080020,0x00080030,0x20080020,0x20080030,
            0x00090020,0x00090030,0x20090020,0x20090030,
            0x00080820,0x00080830,0x20080820,0x20080830,
            0x00090820,0x00090830,0x20090820,0x20090830 },
            /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
            { 0x00000000,0x02000000,0x00002000,0x02002000,
            0x00200000,0x02200000,0x00202000,0x02202000,
            0x00000004,0x02000004,0x00002004,0x02002004,
            0x00200004,0x02200004,0x00202004,0x02202004,
            0x00000400,0x02000400,0x00002400,0x02002400,
            0x00200400,0x02200400,0x00202400,0x02202400,
            0x00000404,0x02000404,0x00002404,0x02002404,
            0x00200404,0x02200404,0x00202404,0x02202404,
            0x10000000,0x12000000,0x10002000,0x12002000,
            0x10200000,0x12200000,0x10202000,0x12202000,
            0x10000004,0x12000004,0x10002004,0x12002004,
            0x10200004,0x12200004,0x10202004,0x12202004,
            0x10000400,0x12000400,0x10002400,0x12002400,
            0x10200400,0x12200400,0x10202400,0x12202400,
            0x10000404,0x12000404,0x10002404,0x12002404,
            0x10200404,0x12200404,0x10202404,0x12202404 },
            /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
            { 0x00000000,0x00000001,0x00040000,0x00040001,
            0x01000000,0x01000001,0x01040000,0x01040001,
            0x00000002,0x00000003,0x00040002,0x00040003,
            0x01000002,0x01000003,0x01040002,0x01040003,
            0x00000200,0x00000201,0x00040200,0x00040201,
            0x01000200,0x01000201,0x01040200,0x01040201,
            0x00000202,0x00000203,0x00040202,0x00040203,
            0x01000202,0x01000203,0x01040202,0x01040203,
            0x08000000,0x08000001,0x08040000,0x08040001,
            0x09000000,0x09000001,0x09040000,0x09040001,
            0x08000002,0x08000003,0x08040002,0x08040003,
            0x09000002,0x09000003,0x09040002,0x09040003,
            0x08000200,0x08000201,0x08040200,0x08040201,
            0x09000200,0x09000201,0x09040200,0x09040201,
            0x08000202,0x08000203,0x08040202,0x08040203,
            0x09000202,0x09000203,0x09040202,0x09040203 },
            /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
            { 0x00000000,0x00100000,0x00000100,0x00100100,
            0x00000008,0x00100008,0x00000108,0x00100108,
            0x00001000,0x00101000,0x00001100,0x00101100,
            0x00001008,0x00101008,0x00001108,0x00101108,
            0x04000000,0x04100000,0x04000100,0x04100100,
            0x04000008,0x04100008,0x04000108,0x04100108,
            0x04001000,0x04101000,0x04001100,0x04101100,
            0x04001008,0x04101008,0x04001108,0x04101108,
            0x00020000,0x00120000,0x00020100,0x00120100,
            0x00020008,0x00120008,0x00020108,0x00120108,
            0x00021000,0x00121000,0x00021100,0x00121100,
            0x00021008,0x00121008,0x00021108,0x00121108,
            0x04020000,0x04120000,0x04020100,0x04120100,
            0x04020008,0x04120008,0x04020108,0x04120108,
            0x04021000,0x04121000,0x04021100,0x04121100,
            0x04021008,0x04121008,0x04021108,0x04121108 },
            /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
            { 0x00000000,0x10000000,0x00010000,0x10010000,
            0x00000004,0x10000004,0x00010004,0x10010004,
            0x20000000,0x30000000,0x20010000,0x30010000,
            0x20000004,0x30000004,0x20010004,0x30010004,
            0x00100000,0x10100000,0x00110000,0x10110000,
            0x00100004,0x10100004,0x00110004,0x10110004,
            0x20100000,0x30100000,0x20110000,0x30110000,
            0x20100004,0x30100004,0x20110004,0x30110004,
            0x00001000,0x10001000,0x00011000,0x10011000,
            0x00001004,0x10001004,0x00011004,0x10011004,
            0x20001000,0x30001000,0x20011000,0x30011000,
            0x20001004,0x30001004,0x20011004,0x30011004,
            0x00101000,0x10101000,0x00111000,0x10111000,
            0x00101004,0x10101004,0x00111004,0x10111004,
            0x20101000,0x30101000,0x20111000,0x30111000,
            0x20101004,0x30101004,0x20111004,0x30111004 },
            /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
            { 0x00000000,0x08000000,0x00000008,0x08000008,
            0x00000400,0x08000400,0x00000408,0x08000408,
            0x00020000,0x08020000,0x00020008,0x08020008,
            0x00020400,0x08020400,0x00020408,0x08020408,
            0x00000001,0x08000001,0x00000009,0x08000009,
            0x00000401,0x08000401,0x00000409,0x08000409,
            0x00020001,0x08020001,0x00020009,0x08020009,
            0x00020401,0x08020401,0x00020409,0x08020409,
            0x02000000,0x0A000000,0x02000008,0x0A000008,
            0x02000400,0x0A000400,0x02000408,0x0A000408,
            0x02020000,0x0A020000,0x02020008,0x0A020008,
            0x02020400,0x0A020400,0x02020408,0x0A020408,
            0x02000001,0x0A000001,0x02000009,0x0A000009,
            0x02000401,0x0A000401,0x02000409,0x0A000409,
            0x02020001,0x0A020001,0x02020009,0x0A020009,
            0x02020401,0x0A020401,0x02020409,0x0A020409 },
            /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
            { 0x00000000,0x00000100,0x00080000,0x00080100,
            0x01000000,0x01000100,0x01080000,0x01080100,
            0x00000010,0x00000110,0x00080010,0x00080110,
            0x01000010,0x01000110,0x01080010,0x01080110,
            0x00200000,0x00200100,0x00280000,0x00280100,
            0x01200000,0x01200100,0x01280000,0x01280100,
            0x00200010,0x00200110,0x00280010,0x00280110,
            0x01200010,0x01200110,0x01280010,0x01280110,
            0x00000200,0x00000300,0x00080200,0x00080300,
            0x01000200,0x01000300,0x01080200,0x01080300,
            0x00000210,0x00000310,0x00080210,0x00080310,
            0x01000210,0x01000310,0x01080210,0x01080310,
            0x00200200,0x00200300,0x00280200,0x00280300,
            0x01200200,0x01200300,0x01280200,0x01280300,
            0x00200210,0x00200310,0x00280210,0x00280310,
            0x01200210,0x01200310,0x01280210,0x01280310 },
            /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
            { 0x00000000,0x04000000,0x00040000,0x04040000,
            0x00000002,0x04000002,0x00040002,0x04040002,
            0x00002000,0x04002000,0x00042000,0x04042000,
            0x00002002,0x04002002,0x00042002,0x04042002,
            0x00000020,0x04000020,0x00040020,0x04040020,
            0x00000022,0x04000022,0x00040022,0x04040022,
            0x00002020,0x04002020,0x00042020,0x04042020,
            0x00002022,0x04002022,0x00042022,0x04042022,
            0x00000800,0x04000800,0x00040800,0x04040800,
            0x00000802,0x04000802,0x00040802,0x04040802,
            0x00002800,0x04002800,0x00042800,0x04042800,
            0x00002802,0x04002802,0x00042802,0x04042802,
            0x00000820,0x04000820,0x00040820,0x04040820,
            0x00000822,0x04000822,0x00040822,0x04040822,
            0x00002820,0x04002820,0x00042820,0x04042820,
            0x00002822,0x04002822,0x00042822,0x04042822 }
            };

        private static uint[,] SPTRANS = new uint[,] {
            /* nibble 0 */
            { 0x00820200, 0x00020000, 0x80800000, 0x80820200,
            0x00800000, 0x80020200, 0x80020000, 0x80800000,
            0x80020200, 0x00820200, 0x00820000, 0x80000200,
            0x80800200, 0x00800000, 0x00000000, 0x80020000,
            0x00020000, 0x80000000, 0x00800200, 0x00020200,
            0x80820200, 0x00820000, 0x80000200, 0x00800200,
            0x80000000, 0x00000200, 0x00020200, 0x80820000,
            0x00000200, 0x80800200, 0x80820000, 0x00000000,
            0x00000000, 0x80820200, 0x00800200, 0x80020000,
            0x00820200, 0x00020000, 0x80000200, 0x00800200,
            0x80820000, 0x00000200, 0x00020200, 0x80800000,
            0x80020200, 0x80000000, 0x80800000, 0x00820000,
            0x80820200, 0x00020200, 0x00820000, 0x80800200,
            0x00800000, 0x80000200, 0x80020000, 0x00000000,
            0x00020000, 0x00800000, 0x80800200, 0x00820200,
            0x80000000, 0x80820000, 0x00000200, 0x80020200 },

            /* nibble 1 */
            { 0x10042004, 0x00000000, 0x00042000, 0x10040000,
            0x10000004, 0x00002004, 0x10002000, 0x00042000,
            0x00002000, 0x10040004, 0x00000004, 0x10002000,
            0x00040004, 0x10042000, 0x10040000, 0x00000004,
            0x00040000, 0x10002004, 0x10040004, 0x00002000,
            0x00042004, 0x10000000, 0x00000000, 0x00040004,
            0x10002004, 0x00042004, 0x10042000, 0x10000004,
            0x10000000, 0x00040000, 0x00002004, 0x10042004,
            0x00040004, 0x10042000, 0x10002000, 0x00042004,
            0x10042004, 0x00040004, 0x10000004, 0x00000000,
            0x10000000, 0x00002004, 0x00040000, 0x10040004,
            0x00002000, 0x10000000, 0x00042004, 0x10002004,
            0x10042000, 0x00002000, 0x00000000, 0x10000004,
            0x00000004, 0x10042004, 0x00042000, 0x10040000,
            0x10040004, 0x00040000, 0x00002004, 0x10002000,
            0x10002004, 0x00000004, 0x10040000, 0x00042000 },

            /* nibble 2 */
            { 0x41000000, 0x01010040, 0x00000040, 0x41000040,
            0x40010000, 0x01000000, 0x41000040, 0x00010040,
            0x01000040, 0x00010000, 0x01010000, 0x40000000,
            0x41010040, 0x40000040, 0x40000000, 0x41010000,
            0x00000000, 0x40010000, 0x01010040, 0x00000040,
            0x40000040, 0x41010040, 0x00010000, 0x41000000,
            0x41010000, 0x01000040, 0x40010040, 0x01010000,
            0x00010040, 0x00000000, 0x01000000, 0x40010040,
            0x01010040, 0x00000040, 0x40000000, 0x00010000,
            0x40000040, 0x40010000, 0x01010000, 0x41000040,
            0x00000000, 0x01010040, 0x00010040, 0x41010000,
            0x40010000, 0x01000000, 0x41010040, 0x40000000,
            0x40010040, 0x41000000, 0x01000000, 0x41010040,
            0x00010000, 0x01000040, 0x41000040, 0x00010040,
            0x01000040, 0x00000000, 0x41010000, 0x40000040,
            0x41000000, 0x40010040, 0x00000040, 0x01010000 },

            /* nibble 3 */
            { 0x00100402, 0x04000400, 0x00000002, 0x04100402,
            0x00000000, 0x04100000, 0x04000402, 0x00100002,
            0x04100400, 0x04000002, 0x04000000, 0x00000402,
            0x04000002, 0x00100402, 0x00100000, 0x04000000,
            0x04100002, 0x00100400, 0x00000400, 0x00000002,
            0x00100400, 0x04000402, 0x04100000, 0x00000400,
            0x00000402, 0x00000000, 0x00100002, 0x04100400,
            0x04000400, 0x04100002, 0x04100402, 0x00100000,
            0x04100002, 0x00000402, 0x00100000, 0x04000002,
            0x00100400, 0x04000400, 0x00000002, 0x04100000,
            0x04000402, 0x00000000, 0x00000400, 0x00100002,
            0x00000000, 0x04100002, 0x04100400, 0x00000400,
            0x04000000, 0x04100402, 0x00100402, 0x00100000,
            0x04100402, 0x00000002, 0x04000400, 0x00100402,
            0x00100002, 0x00100400, 0x04100000, 0x04000402,
            0x00000402, 0x04000000, 0x04000002, 0x04100400 },

            /* nibble 4 */
            { 0x02000000, 0x00004000, 0x00000100, 0x02004108,
            0x02004008, 0x02000100, 0x00004108, 0x02004000,
            0x00004000, 0x00000008, 0x02000008, 0x00004100,
            0x02000108, 0x02004008, 0x02004100, 0x00000000,
            0x00004100, 0x02000000, 0x00004008, 0x00000108,
            0x02000100, 0x00004108, 0x00000000, 0x02000008,
            0x00000008, 0x02000108, 0x02004108, 0x00004008,
            0x02004000, 0x00000100, 0x00000108, 0x02004100,
            0x02004100, 0x02000108, 0x00004008, 0x02004000,
            0x00004000, 0x00000008, 0x02000008, 0x02000100,
            0x02000000, 0x00004100, 0x02004108, 0x00000000,
            0x00004108, 0x02000000, 0x00000100, 0x00004008,
            0x02000108, 0x00000100, 0x00000000, 0x02004108,
            0x02004008, 0x02004100, 0x00000108, 0x00004000,
            0x00004100, 0x02004008, 0x02000100, 0x00000108,
            0x00000008, 0x00004108, 0x02004000, 0x02000008 },

            /* nibble 5 */
            { 0x20000010, 0x00080010, 0x00000000, 0x20080800,
            0x00080010, 0x00000800, 0x20000810, 0x00080000,
            0x00000810, 0x20080810, 0x00080800, 0x20000000,
            0x20000800, 0x20000010, 0x20080000, 0x00080810,
            0x00080000, 0x20000810, 0x20080010, 0x00000000,
            0x00000800, 0x00000010, 0x20080800, 0x20080010,
            0x20080810, 0x20080000, 0x20000000, 0x00000810,
            0x00000010, 0x00080800, 0x00080810, 0x20000800,
            0x00000810, 0x20000000, 0x20000800, 0x00080810,
            0x20080800, 0x00080010, 0x00000000, 0x20000800,
            0x20000000, 0x00000800, 0x20080010, 0x00080000,
            0x00080010, 0x20080810, 0x00080800, 0x00000010,
            0x20080810, 0x00080800, 0x00080000, 0x20000810,
            0x20000010, 0x20080000, 0x00080810, 0x00000000,
            0x00000800, 0x20000010, 0x20000810, 0x20080800,
            0x20080000, 0x00000810, 0x00000010, 0x20080010 },

            /* nibble 6 */
            { 0x00001000, 0x00000080, 0x00400080, 0x00400001,
            0x00401081, 0x00001001, 0x00001080, 0x00000000,
            0x00400000, 0x00400081, 0x00000081, 0x00401000,
            0x00000001, 0x00401080, 0x00401000, 0x00000081,
            0x00400081, 0x00001000, 0x00001001, 0x00401081,
            0x00000000, 0x00400080, 0x00400001, 0x00001080,
            0x00401001, 0x00001081, 0x00401080, 0x00000001,
            0x00001081, 0x00401001, 0x00000080, 0x00400000,
            0x00001081, 0x00401000, 0x00401001, 0x00000081,
            0x00001000, 0x00000080, 0x00400000, 0x00401001,
            0x00400081, 0x00001081, 0x00001080, 0x00000000,
            0x00000080, 0x00400001, 0x00000001, 0x00400080,
            0x00000000, 0x00400081, 0x00400080, 0x00001080,
            0x00000081, 0x00001000, 0x00401081, 0x00400000,
            0x00401080, 0x00000001, 0x00001001, 0x00401081,
            0x00400001, 0x00401080, 0x00401000, 0x00001001 },

            /* nibble 7 */
            { 0x08200020, 0x08208000, 0x00008020, 0x00000000,
            0x08008000, 0x00200020, 0x08200000, 0x08208020,
            0x00000020, 0x08000000, 0x00208000, 0x00008020,
            0x00208020, 0x08008020, 0x08000020, 0x08200000,
            0x00008000, 0x00208020, 0x00200020, 0x08008000,
            0x08208020, 0x08000020, 0x00000000, 0x00208000,
            0x08000000, 0x00200000, 0x08008020, 0x08200020,
            0x00200000, 0x00008000, 0x08208000, 0x00000020,
            0x00200000, 0x00008000, 0x08000020, 0x08208020,
            0x00008020, 0x08000000, 0x00000000, 0x00208000,
            0x08200020, 0x08008020, 0x08008000, 0x00200020,
            0x08208000, 0x00000020, 0x00200020, 0x08008000,
            0x08208020, 0x00200000, 0x08200000, 0x08000020,
            0x00208000, 0x00008020, 0x08008020, 0x08200000,
            0x00000020, 0x08208000, 0x00208020, 0x00000000,
            0x08000000, 0x08200020, 0x00008000, 0x00208020 }
        };

    }
}